Problem 15

src/main/scala/ninetyNineScalaProblems/Problem15.scala

@@ -0,0 +1,29 @@
+package ninetyNineScalaProblems
+
+import scala.annotation.tailrec
+
+object Problem15:
+    def fillList(value: Any, repititions: Int): List[Any] =
+        @tailrec
+        def loop(cursor: Int, acc: List[Any]): List[Any] =
+            cursor match
+                case c if c > 0 =>
+                    loop(cursor - 1, value :: acc)
+                case 0 =>
+                    acc
+
+        loop(repititions, List())
+
+    def duplicateElementsTimes(times: Int, list: List[Any]): List[Any] =
+        @tailrec
+        def loop(cursor: List[Any], acc: List[Any]): List[Any] =
+            cursor match
+            case e :: tail =>
+                loop(tail, fillList(e, times) ::: acc)
+            case Nil =>
+                acc
+
+        loop(list, List()).reverse
+
+    def duplicateElementsTimes2(times: Int, list: List[Any]): List[Any] =
+        list.flatMap(i => List.fill(times)(i))